Combination motor and pump unit



Feb. 13, 1940. w. P. SCHIRMER 2,190,246

COMBINATION MOTOR AND PUMP UNIT Filed Dec. 1, 1938 2 Sheets-Sheet 1" Feb. 13, 1940.

w. P. SCHIRMER COMBINATION MOTOR AND PUMP UNIT 2 Sheets-Sheet 2 Filed Dec. 1, 1938 Patented Feb. 13, 1940 columns-non 2.190.246 I MOTOR sun rum" UNIT Waldo I. Schirmer, Ouyahoga County, Ohio Application December 1, 1938, Serial No. 243,435

2 Claims. (or. 103-118) The present invention relates to a motor operated pump andin particular to anlarrangement in which the are combined in a single'compact unit. This pumping unitisprincipally adapted to the pumping of gasoline, or other. volatilev fluids which produce a." highly explosive gas when mixed with the proper amount of oxygen. The pump and motor are retained within closely associated separate compartments which form the supporting element for the motor and pump.

The primary object of the invention is to provide an improved pumping unit of this character which will reduce the possibility of fire hazards to a minimum. .This being accomplished by a novel construction which allows for a part of the liquid passing through'the pump'to circulate through the -motor compartment and maintainingthe liquid in-the motor compartment at a predetermined level.

Another object of the such a pumping unit which is of compact design in order that it may be installed in a space of minimum size.

Still another object of the invention is to provide a pumping unit of this type which is constructed of a minimum number of parts yet rugged and durable and which maybe manufac tured at a comparatively low cost. a

while several objects'of the invention have been specifically set forth above, other objects will appear from the following specifications when taken in connection with the drawings which form a part of this application, and in which: r i

Fig. 1 is a sectional view of the unit taken along the line l l of Fig. 2.

Fig. 2 is a view in elevation of the pump end of the unit.

Fig. 3 is a fragmentary sectional view taken. along the line 3-3 elements.

the present embodiment prises a housing 2 having closing the motor and a 50 closing the pump elements. The pump as shown is of the internal rotary type and involves broadly the principles set forth. inmy Patent Briefly the pump is composed of two rotary 5 -members I: and M, which are provided with in-,

motor and pump elements invention is to,-provide pump element I4 by of Fig. 1 showing the pump- Fig. 4 is a fragmentary sectional view taken.

.portedontheshaflathereis ner meshing gear teeth I! and I4 The pump compartment 6 is closed on the outer side by the plate I. This plate is'held in position by the bolts I 8. Secured within the plate I6 is a shaft 2| upon which the pumping element 5 I2 is supported in operating position'with the cooperative pump element l4. The compartment 4 in which the motor is encased is provided with bearing supports l1 and I! in which the bearings 20 and 22 are received and in shaft 24 of the motor is rotatable. Secured to the shaft 24 is the rotor element 26 of the motor.

' The field windings 28 are located adjacent the inner circumference of the compartment 4. This compartment is provided with an end bellmem- 15 her 2' for hermetically sealing the outer end of the compartment and is secured to the housing 2 by suitable studs 30. For preventing leakage through the end bearing II, the bearing support I1 is provided with a plug member 32, threadedly receivable in the outer end thereof. Extending through the bearing supports perpendicular to the direction of the shaft are wells 34 and 36 respectively.

, for conveyinga part of the liquid in the motor I compartment to the bearings. 'lhe bearings 2|! 25 and 22 are provided with grooves "and I! for distributing the fluid evenly through the bearings. One end of the shaft 24 is secured to the the key element M" for fixing the pumpelement l4 to that it will rotate therewith.

Leading to the pump is anintake or suction passage 40 and an outlet or discharge e 42. These passages are shown extending upwardly from the pump, but they may extend in any de- 35 sirable direction orat any angle most convenient forinstallation. There is provided adjacent the upper limitsof the motor compartment 4 an opening leading from-the suction e 40 into the compartment and also an opening 52 leading from the motor compartment to the dis- -.2 charge or pressure e 42.

Associated with the suction and pressure passages and 42 is a pressure valve 4!, the details of which are not shown. The purpose of this pressure valve being to function under a predetermined pressure for allowing the fluid in the pressureeto enter the suction passage when the pressure too great byoperating the pump when the closed.

Referring to 4 the inlet and outlet pas sages are provided with an improved port design. Apart from the. pmnplng elements being sup-' an additional supwhich the '10 the shaft in order 30;

discharge outlet is 50 a the outlet passage 42.

port in the crescent member 56 which is in turn supported by the plate It or otherwise retained within the pump compartment. This crescentshaped member extends between the pumping elements l2 and I4 through approximately onehalf of their circumference, the remaining portion of the circumference of the member I4 is furnished additional support by the members 60 and 62. These membersextend throughout the distance of the intake and outlet ports and are tapered toward the side of the pump elements adjacent their ends 60 and 62'. This arrangement prevents the pump from howling by permitting the gradual closing of the ports. This not only prevents the pump from howling but as stated above it also furnishes an additional supporting means for the pump element I4 throughout the area occupied by the ports.

The particular type of motor used in this unit is a single phase motor having no brushes or other equipment that will cause the motor to create a spark while being started or in operation. The starting apparatus is set up at a convenient safe distance from the fuel and is well known to those familiar with the art of electric motors.

In operation the motor is first preferably filled with the liquid to be pumped, which is usually gasoline, kerosene, or other fluids of similar character. The motor is caused to operate the pump by introducing the proper electric current thereto. 'This in turn rotates the shaft 24 and the pump element M. This causes the pump element I2 to also operate, setting up a suction through the intake passage 40 and a pressure in Assuming the pump is primed, the pumping action will start at once, the fluid entering the passage 40 and being discharged through the passage 42. As the fluid is discharged a portion will enter the opening 52 leading to the compartment 4, and will be discharged through the opening leading from the compartment 4 to the suction passage 40. This oper-' ation assures a fresh supply of liquid to be always within the motor compartment, which acts to remove the heat created by the motor and at the same time keeps the temperature of the liquid within the compartment at a low degree. It is advisable to have larger than the outlet opening 50, in order that the fluid within the compartment will be under a slight pressure.

This arrangement dispenses with the customary stufling box which is used about the pump shaft. While the amount of escaping fluid may be very slight through this stufiing box, it does create a line and other like fluids.

uppermost point in for withdrawing said fluid from said motor comthe inlet opening 52 slightly very dangerous fire hazard, particularly where the fluid being handled is capable of producing a highly explosive gas.

In the present apparatus the field windings and rotor of the motor are impregnated with a suitable compound to make them impervious to gaso- The level of the fluid in the motor compartment is preferably kept at a point above the rotating member 26, although the fluid may be kept at any desired height which is best suited to e circumstances under which the fluid is being pumped.

While the invention has illustrated in a particular form it is not intended that it be limited to this particular description of use, as the scope of the invention is best defined in the following claims.

I claim:

1. In combination; a motor and a fluid pump, a fluid inlet and outlet passage to said pump, said motor and pump having an hermetically sealed housing enclosing said pump and motor, a separate compartment within said housing for said motor, an inlet to the said motor compartment from the fluid outlet passage for allowing the passage of a part 01 the fluid being pumped to enter said compartment, means for withdrawing said fluid from said motor compartment, said means comprising an opening leading from a point at the top of the cavity oi! said motor compartment into the pump inlet passage and means for releasing the pressure in the fluid outlet passage by allowing the fluid to escape into the fluid inlet passage.

2. In combination; a motor and fluid pump unit having a housing for enclosing the same, a separate compartment within said housing for said motor, a separate compartment within said housing for said pump unit, a suction passage and discharge passage connected with said pump unit through which the said fluid is circulated, inlet means connecting the said discharge passage and the motor compartment for allowing a part of the discharge fluid to enter said motor compartbeen described and ment, and means connecting the said suction 4 passage and the motor compartment at the the said motor compartment partment only after the said motor compartment has been completely fllled, the inlet to said motor compartment being of a larger cross-sectional area than the said outlet, thereby creating a pressure on the said fluid within the compartment.

WALDO P. SCHIRMER. 

